| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | is [adv] [verb] and | 1172 |
|
| 2 | is [adv] difficult [verb] | 830 |
|
| 3 | [adv] difficult [verb] and | 109 |
|
| 4 | is [adv] difficult and | 38 |
|
| 5 | is difficult [verb] and | 30 |
|
